Search found 286 matches

by AlecK
Thu Nov 26, 2020 8:42 am
Forum: Selection and Installation of Wiring Systems
Topic: Support & fixing of cables 3.9.3.3
Replies: 7
Views: 108

Re: Support & fixing of cables 3.9.3.3

Poking holes is not a good approach Better to try to understand the principles - and that's exactly what the words give you. The mechanical characteristics of the wiring system must be taken into account when determining whether, in a particular situation, additional mechanical protection is require...
by AlecK
Wed Nov 25, 2020 8:43 am
Forum: General Electrical Discussions
Topic: Arc flash and electric shock analysis
Replies: 1
Views: 45

Re: Arc flash and electric shock analysis

AS/NZS 4836 "Safe working on or near LV installations and equipment" includes guidance on PPE in general and arc flash in general.
And ESR 100 says we must follow it when doing PEW unless we are instead following a certified design
by AlecK
Tue Nov 24, 2020 9:15 am
Forum: Selection and Installation of Wiring Systems
Topic: Support & fixing of cables 3.9.3.3
Replies: 7
Views: 108

Re: Support & fixing of cables 3.9.3.3

Yes there's a degree of interpretation needed. It's a high-level statement; and can't deal with the specifics of every possible situation. (the book's long enough now!) But there's no way the double insulation of TPS can be taken as enough, by itself, to cope with being stood on against a hard objec...
by AlecK
Sat Nov 21, 2020 10:26 am
Forum: Generators and Solar
Topic: Ordinary Duty Flexible Cord for PCE connection
Replies: 1
Views: 37

Re: Ordinary Duty Flexible Cord for PCE connection

Electrical equipment [1.4.46] includes just about everything. But not all wiring to / from equipment is "equipment wiring". For example; an mcb is "electrical equipment" , and a socket outlet is "electrical equipment", but the wiring between them is "installation wiring". The connection between PCE ...
by AlecK
Fri Nov 20, 2020 5:05 pm
Forum: Protective Devices
Topic: Double pole main switch
Replies: 1
Views: 43

Re: Double pole main switch

nothing to prohibit that. but equally no requirement for linking, either. The rule[2.3.3.1] is minimum 1 main switch per supply, in particular 1 per safety service plus 1 for general. In domestic there usually won't be any safety services. Then 2.3.3. says keep them to the minimum, and for domestic ...
by AlecK
Fri Nov 20, 2020 11:38 am
Forum: Selection and Installation of Wiring Systems
Topic: Support & fixing of cables 3.9.3.3
Replies: 7
Views: 108

Re: Support & fixing of cables 3.9.3.3

Exactly. And 3.3.2.8 sets the minimum fixing as "so as to minimise damage to cable insulation, sheathing and connections during installation, operation, and maintenance". So for a ceiling space there's no absolute requirement to use any form of fixing at all. eg for runs parallel to joists; laid acr...
by AlecK
Fri Nov 20, 2020 8:48 am
Forum: Appliances
Topic: Business electrically testing their awnings
Replies: 4
Views: 75

Re: Business electrically testing their awnings

Every paragraph within Clause 2 of Schedule 1 stands alone; and can be read without reference to any other paragraph. However they have been arranged in groups; each group being given a heading indicates something in common. The section headings are intended to help us find the relevant paragraph. S...
by AlecK
Thu Nov 19, 2020 9:21 am
Forum: Appliances
Topic: Business electrically testing their awnings
Replies: 4
Views: 75

Re: Business electrically testing their awnings

It's covered in Schedule 1 of ESRs; which defines what is - and isn't - PEW. Probably time you reviewed this, as it's clear your understanding is well out of date. You mention that not being done for hire / reward might have made the work exempt. Hire / reward is a factor for some types of work, as ...
by AlecK
Mon Nov 16, 2020 2:06 pm
Forum: Inspection
Topic: WoEF
Replies: 6
Views: 94

Re: WoEF

Of course the only real relevance of whether these activities are PEW is that if they were PEW; the EWRB could properly take action for alleged error / non-compliant work. But since these activities are not PEW, EWRB can't take action. Their disciplinary powers are mostly limited to people who do PE...
by AlecK
Mon Nov 16, 2020 8:48 am
Forum: Inspection
Topic: WoEF
Replies: 6
Views: 94

Re: WoEF

No part of Schedule 1 Clause 1 can be properly interpreted as including assessment for issue of WoEF. In particular, while the assessment involves inspection,testing, and issuing a certificate; the relevant items in Schedule 1 are : "the testing of work described in paragraphs (a) to (d)", "the insp...
by AlecK
Thu Nov 12, 2020 9:20 am
Forum: Earthing and Bonding
Topic: Cable tray
Replies: 5
Views: 137

Re: Cable tray

Earthing the tray would need to be done based on size of largest conductor present. And even so wouldn't necessarily do any good; as the forklift (or whatever) that caused the damage could be livened without bridging to the tray. Our rules are designed around dealing with single-fault situations tha...
by AlecK
Thu Nov 12, 2020 9:03 am
Forum: Testing & Verification
Topic: CoVs
Replies: 2
Views: 83

Re: CoVs

What the law requires: ESR 74 says that installations, or parts of installations, that have been disconnected or isolated for more than 6 months, then the person doing the re-connection / re-livening must sight a certificate. The certificate must state that the installation / part installation is "s...
by AlecK
Fri Nov 06, 2020 10:01 am
Forum: Switchboards
Topic: Exposed parts near mcb and meter
Replies: 6
Views: 136

Re: Exposed parts near mcb and meter

1: No. Even with so-called "smart" meters, some readings are manual. 2: Yes (for new installations) 3: while "BTS" units are often re-used; each time they are installed is installation PEW and they need to be compliant with current requirements. The idea that they can be treated as an 'existing inst...
by AlecK
Fri Nov 06, 2020 9:42 am
Forum: Generators and Solar
Topic: Solar Earth Value
Replies: 9
Views: 139

Re: Solar Earth Value

As per my earlier, there are several possible sources of earth fault current; including lightning, faults in the array wiring & modules, and faults in the inverter which may allow a.c. to be applied to the array wiring. where there a battery in the arrangement, that also needs to be considered as a ...
by AlecK
Thu Nov 05, 2020 2:58 pm
Forum: Generators and Solar
Topic: Solar Earth Value
Replies: 9
Views: 139

Re: Solar Earth Value

If the source of the fault current is the inverter and / or the rest of the installation, then the protective device(s) in question are those on the output circuit of the inverter supplying LV to the installation. Noting that inverters with transformer can't pass fault current from a.c. back to the ...
by AlecK
Thu Nov 05, 2020 10:11 am
Forum: Electric Vehicles and Charging Systems
Topic: General requirements for electric vehicle charging stations
Replies: 6
Views: 417

Re: General requirements for electric vehicle charging stations

NZ requirements are based on IEC requirements. The performance requirements for various Types of RCD are set by AS/NZS 61008.1 & 61009.1 (RCCBs & RCBOs); which are based on same-number IEC Standards. They specify parameters for each "letter" type WRT wave-form of the fault current. Also AS/NZS 3190 ...
by AlecK
Thu Nov 05, 2020 9:37 am
Forum: Generators and Solar
Topic: Solar Earth Value
Replies: 9
Views: 139

Re: Solar Earth Value

true , pluto, but that doesn't actually answer the question. Normal protective earthing (fault protection by automatic disconnection of supply" sets - PEC size by reference to size of largest relevant active ; and - PEC continuity by reference to the fault current (ie the fault current that will cau...
by AlecK
Thu Nov 05, 2020 9:22 am
Forum: Switchboards
Topic: Exposed parts near mcb and meter
Replies: 6
Views: 136

Re: Exposed parts near mcb and meter

Yes 3.10.1.1 (c) allows for single insulation within enclosures provided such parts are not 'exposed to touch" during normal operations. In this case all the MSB & BTS type operations are external to the meter enclosure; so it can be treated same as a normal meter enclosure. The mcb being there only...
by AlecK
Wed Nov 04, 2020 8:37 am
Forum: Generators and Solar
Topic: Adding battery to solar.
Replies: 2
Views: 77

Re: Adding battery to solar.

Not forgetting 5139, assuming the batteries are lithium type; or 3011 series for lead-acid batteries
by AlecK
Wed Nov 04, 2020 8:33 am
Forum: Selection and Installation of Wiring Systems
Topic: Under deck cable protection
Replies: 1
Views: 79

Re: Under deck cable protection

The rules are that, under the Electricity (Safety) Regulations, ESR 59 requires both low voltage and extra-low voltage parts of installations must comply with AS/NZS 3000. 12 V wiring is in the extra-low voltage category. That means it's not "prescribed electrical work" so no authorisation (licence)...
by AlecK
Thu Oct 29, 2020 9:11 am
Forum: Inspection
Topic: Esr 70
Replies: 7
Views: 156

Re: Esr 70

Who carries the can depends on exactly what was done / not done. There are several individuals who can be held to account. For general work, there's the person who does the work, the person who certifies it, and then the person who connects. They may well all be the same person, but the lines of res...
by AlecK
Tue Oct 27, 2020 6:09 pm
Forum: Inspection
Topic: Does replacement of a fitting in a medical installation require inspection
Replies: 3
Views: 142

Re: Does replacement of a fitting in a medical installation require inspection

There's a distinction that must be made between two different uses of the word "inspection". There's the sense the word is used in standards; being the basic act of checking things that's part of every job Then there's the sense the word carries in ESRs, being Inspection of high-risk PEW. That sort ...
by AlecK
Sat Oct 24, 2020 9:44 am
Forum: Earthing and Bonding
Topic: Earth Electrode with NO MEN Link
Replies: 2
Views: 169

Re: Earth Electrode with NO MEN Link

Short answer: No. The system as described does not have an acceptable system of protective earthing for either of the 2 DBs and their associated final subcircuits. Any "Part 1 solution" must always be no less safe than working to Part 2. It was at one time acceptable to use a PEN submain (c/w N-E li...
by AlecK
Sat Oct 24, 2020 9:30 am
Forum: Distribution, Networks & Metering
Topic: Connection to Pole Top Fuses.
Replies: 3
Views: 138

Re: Connection to Pole Top Fuses.

Yes any of those types of PL are authorised to do that sort of PEW. However those "pole fuses" are network property, and will almost certainly be the POS for the installation (and therefore be the demarcation point between "works" & "installation"); so the network's authorisation is required for mak...
by AlecK
Tue Oct 20, 2020 5:55 pm
Forum: Generators and Solar
Topic: Lockable main switch at switchboard connection - 4777.1 2005
Replies: 7
Views: 181

Re: Lockable main switch at switchboard connection - 4777.1 2005

That's a subclause. It's part of the higher-level clause 5.3; which is about the ac connection of inverter output to a switchboard of the installation. So has to be read in that context. Ie it is talking about the main switch that isolates the incoming supply from the inverter to the installation. T...
by AlecK
Thu Oct 15, 2020 10:27 am
Forum: Selection and Installation of Wiring Systems
Topic: Old unknown cable
Replies: 10
Views: 291

Re: Old unknown cable

The "must comply with" bit is not true; there's no Reg stating that. What it says[ESR 80] is they must be safe, and those three methods are guaranteed to get you to "safe" (for new fittings). There's a faction within worksafe that simply doesn't understand that 'xyz is deemed to comply' is NOT the s...
by AlecK
Thu Oct 15, 2020 9:53 am
Forum: General Electrical Discussions
Topic: 110V appliances and outlets
Replies: 1
Views: 115

Re: 110V appliances and outlets

I don't believe there is any rule to prohibit this arrangement; regardless of on / off grid. Would need to pay close attention to short circuit protection & fault protection; and the absolute requirement for final subcircuits supplying sockets / lighting to be RCD-protected (I strongly suspect you w...
by AlecK
Wed Oct 14, 2020 6:25 pm
Forum: Selection and Installation of Wiring Systems
Topic: Old unknown cable
Replies: 10
Views: 291

Re: Old unknown cable

Often the installer is also the supplier; but it's important to keep the 2 roles separate, because there are different requirements for each. Electrical fittings (which includes cables) supplied / sold must be electrically safe [ESR 80]. There are a number of ways of them being deemed safe (differen...
by AlecK
Wed Oct 14, 2020 10:18 am
Forum: Selection and Installation of Wiring Systems
Topic: Old unknown cable
Replies: 10
Views: 291

Re: Old unknown cable

Nothing on ESRs or Wiring rules requires all cables used to be new; or to comply with any particular Standard. Smaller cables are DMRAs, needing SDoC for sale / supply; but that doesn't affect installing them. Wiring systems must comply with 3.2 of "3000' but that allows for equivalent safety so doe...
by AlecK
Wed Oct 14, 2020 10:09 am
Forum: Selection and Installation of Wiring Systems
Topic: Triple Plating an Isolator
Replies: 3
Views: 127

Re: Triple Plating an Isolator

That's OK for a functional switch; but not for a required isolating switch. Isolation is defined [1.4.62 of "3000"], so a required isolating device has to perform that function as defined. If it doesn't remove "every source of energy" in the manner set by the requirement calling for it; then it isn'...
by AlecK
Wed Oct 14, 2020 9:51 am
Forum: Transportable Installations
Topic: Non-caravan Woef/RCD requirements
Replies: 6
Views: 312

Re: Non-caravan Woef/RCD requirements

3012 / 2.9 requires both the TS (CI for NZ) and the site supply to comply with "3001" plus some additional requirements. True complying with "3012" isn't mandatory (construction site installations are listed in ESR 25 as being deemed to be electrically safe IF they comply); but the 6-monthly mandato...
by AlecK
Wed Oct 14, 2020 9:10 am
Forum: Distribution, Networks & Metering
Topic: Domestic or Commercial? How to tell
Replies: 3
Views: 130

Re: Domestic or Commercial? How to tell

It has nothing to do with how the installation was classified by the distributor. They lost their god-like status of "Electrical Supply Authority" away back in 1993. In my view it comes down to deciding what the primary function of the premises as a whole is. For a farm house not subdivided from the...
by AlecK
Wed Oct 14, 2020 8:33 am
Forum: Generators and Solar
Topic: Solar Smart Meters Location
Replies: 3
Views: 120

Re: Solar Smart Meters Location

If the meter fits any Exception to 2.2.3.1; it can be on line side of - and therefore not controlled be - the main switch I agree there seems to be no functional requirement for this equipment to be so located; so (c) doesn't apply. And I'm assuming this isn't a revenue meter, but rather a check met...
by AlecK
Tue Oct 13, 2020 11:34 am
Forum: Distribution, Networks & Metering
Topic: Domestic or Commercial? How to tell
Replies: 3
Views: 130

Re: Domestic or Commercial? How to tell

Domestic is defined: clause 1.4.48 (2007 edition as cited). There's no such classification as "commercial"; either it's domestic or it's not. Where any part of the installation fits the "domestic" definition, that part must follow "domestic" requirements. There are not many areas where different rul...
by AlecK
Tue Oct 13, 2020 11:31 am
Forum: Transportable Installations
Topic: Non-caravan Woef/RCD requirements
Replies: 6
Views: 312

Re: Non-caravan Woef/RCD requirements

"was there a time when it was legally accepted to wire such installations without a MEN link and no RCD protection? " Yes, there was. But that does not directly affect issuing a WoEF. You've found C6.9; but whole you're correct that (b), (c) & (d) apply only to caravans, (a) applies to non-caravans....
by AlecK
Tue Oct 13, 2020 8:51 am
Forum: Appliances
Topic: Is a rocker switch able to installed horizontally?
Replies: 5
Views: 208

Re: Is a rocker switch able to installed horizontally?

There is no rule about orientation of either isolating or functional switches. Noting that the switch required by 4.7.1 is a functional switch. So nothing non-compliant with having 'rocker' or 'lever' action switches operation side-2-side rather than traditional up / down. I suspect the Schneider in...
by AlecK
Mon Oct 12, 2020 9:33 am
Forum: Generators and Solar
Topic: Solar Smart Meters Location
Replies: 3
Views: 120

Re: Solar Smart Meters Location

Insufficient detail
Question is headed "PV" but appears to actually relate to mains parallel inverter.

Presume the "main switch" referred to is the main switch for the inverter supply to the installation ?
by AlecK
Mon Oct 12, 2020 9:28 am
Forum: Selection and Installation of Wiring Systems
Topic: Triple Plating an Isolator
Replies: 3
Views: 127

Re: Triple Plating an Isolator

please define what you mean by "triple plating" in this context
by AlecK
Fri Oct 09, 2020 4:54 pm
Forum: Standards and Legislation
Topic: Electricity Act Reg 82(2)
Replies: 8
Views: 207

Re: Electricity Act Reg 82(2)

Yes a case could well be made along those lines Of course any prospective purchaser should be asking for that sort of info, as well as having a pre-purchase check. Up to 1993 all work had to be permitted by Supply Authority; though these records may not still be available High risk work in recent ye...
by AlecK
Fri Oct 09, 2020 12:23 pm
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 6
Views: 224

Re: Socket outlet on 1mm2, and other sins.

I note that some data (relating to the customer) was redacted; and hope my comment doesn't lead to the ID of the TA being redacted in future. Those of us who operate as Inspectors have a duty to be better than merely average; even for just normal third-party inspection of high-risk work. If you're n...
by AlecK
Fri Oct 09, 2020 12:12 pm
Forum: Standards and Legislation
Topic: Electricity Act Reg 82(2)
Replies: 8
Views: 207

Re: Electricity Act Reg 82(2)

Sorry; I assumed you meant "Regulation" (as in ESRs) and not "Section" (as in Act). Clause (2) of Section 82 doesn't mean that eg a house for sale has to be specially tested. It just makes it illegal to sell the house (or other installation / works / appliance) unless all PEW that has been done in i...
by AlecK
Thu Oct 08, 2020 2:56 pm
Forum: Standards and Legislation
Topic: Electricity Act Reg 82(2)
Replies: 8
Views: 207

Re: Electricity Act Reg 82(2)

Technically, yes; ESR 80 requires the fittings that make up the electrical installation in a house to be electrically safe when sold / offered for sale. Note that ESR 80 applies to both new & used; and nothing restricts it to apply only to fittings that are not part of an installation. But that's no...
by AlecK
Thu Oct 08, 2020 9:42 am
Forum: Appliances
Topic: Swim Spa
Replies: 1
Views: 121

Re: Swim Spa

mentioning that sort of thing might reduce sales!
by AlecK
Thu Oct 08, 2020 9:40 am
Forum: Appliances
Topic: Spa pool
Replies: 1
Views: 87

Re: Spa pool

Yes; all of 4.8 applies
The isolation requirement was aimed at helping plumbers work safely; and that applies to spas & swimming pools just as much as to a HWC
by AlecK
Thu Oct 08, 2020 9:36 am
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 6
Views: 224

Re: Socket outlet on 1mm2, and other sins.

Thanks. And well done for making the effort to read these Decisions I'm sure they will generate lots of discussion here; though may be difficult to slot them into the structure as any one Decision ranges across a number of different topic headings. I've never gone as far as to identify which lights ...
by AlecK
Thu Oct 08, 2020 8:47 am
Forum: Standards and Legislation
Topic: Electricity Act Reg 82(2)
Replies: 8
Views: 207

Re: Electricity Act Reg 82(2)

Why wouldn't it? It can't be OK for anyone to apply a false tag / marking. And it can't be OK for stuff marked as CCA compliant - and therefore allowed to be sold in NZ under ESR 80(2) - to be sold if it doesn't meet the requirements for the marking. Just 'cos something's been installed into a house...
by AlecK
Wed Oct 07, 2020 10:23 am
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 6
Views: 224

Re: Socket outlet on 1mm2, and other sins.

Would help if the case reference were included. The summaries published in Electron have never included enough information to serve any educational purpose; and while i welcome the fact that the full Decisions are now made available, I haven't yet had time to read up the cases. These comments theref...
by AlecK
Fri Oct 02, 2020 12:54 pm
Forum: Switchboards
Topic: First switchboard or metering point.
Replies: 5
Views: 236

Re: First switchboard or metering point.

Yes, you are correct that a structure can have several distinct installations within it.
Not just a few; sometimes several per floor over many floors.
Each must have own "main switch(es), MEN, and MEC; but can share electrode
by AlecK
Fri Oct 02, 2020 12:51 pm
Forum: Standards and Legislation
Topic: Commissioning
Replies: 1
Views: 97

Re: Commissioning

The key is whether the electrical work being done is PEW; as defined in Schedule 1; if it's PEW, then persons without licence can't do it. However assembly of equipment isn't always PEW. Most common example being switchboard manufacture; but can apply to other types of equipment such as industrial p...